Adsorption kinetics
The experimental data relating to adsorption of RhB onto natural diatomite was investigated
using the Lagergren pseudo-first and pseudo-second order equation (Aivalioti
et al., 2010; Chan et al., 2011):
log (qe – qt) = logqe –
2.303
k1t
(9)
t
q k q q
t
t e
1 1
2
2
(10)
where, qe is the amount of Rh-B adsorbed at equilibrium (mg/g), qt amount of Rh-B
adsorbed at various times, t time of adsorption duration, and k1 is a rate constant of the
equation (min–1).